As of 11 a.m. ET, 24 workers had been sent to hospitals, said John Nalbone, communications and public information officer for Robbinsville Township, New Jersey. That total includes the person who was critically injured.

An additional 30 people were treated at the scene of the fulfillment center, located in Robbinsville in an industrial park off Interstate 195. There is no threat to area residents, Nalbone said.

The can fell off a shelf on the third floor of the warehouse and accidentally dispersed, Nalbone said.

“The safety of our employees is our top priority, and as such, all employees in that area have been relocated to safe place and employees experiencing symptoms are being treated onsite," Amazon spokeswoman Rachel Lighty said in a statement. "As a precaution, some employees have been transported to local hospitals for evaluation and treatment. We appreciate the swift response of our local responders.”

Emergency responders received a call just before 9 a.m. that 80 workers were complaining of difficulty breathing and burning in their eyes and throat. A triage area was set up outside the warehouse to treat patients. Fifty-four workers at the facility reported difficulty breathing and a burning sensation in the eyes and throat, Nalbone said. The 30 people treated at the scene did not need further medical attention, he said.

Amazon spokeswoman Lighty said the incident would not delay operations or shipments at the warehouse. She said the cause of the incident was under investigation.